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Revision: Is matter around us pure, , 1. How can you change a saturated solution to an, unsaturated solution without adding any more solvent to, it?, , 2. Based on which factor a solution is said to be diluted,, concentrated or saturated?, , 3. What is mass per cent of a solution?, , 4. In what respect does a true solution differ from a, colloidal solution?, , 5. ‘Sea water can be classified as homogeneous as well as, heterogeneous mixture.’ Comment., , 6. Explain why particles of a colloidal solution do not settle, down when left undisturbed, while in the case of a, suspension they do., , 7. Identify the dispersed phase and dispersion medium in, the following examples of colloids:, , (a) Fog, (b) Cheese, (c) Coloured gemstone., , 8. Smoke and fog both are aerosols. In what way are they, different?, , 9. What are the favourable qualities given to gold when it is, alloyed with copper or silver for the purpose of making, ornaments?